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Machinable calcium pyrophosphate glass-ceramics

Published online by Cambridge University Press:  26 November 2012

Toshihiro Kasuga ,
Miwako Terada ,
Masayuki Nogami  and
Mitsuo Niinomi
Toshihiro Kasuga*
Affiliation:
Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
Miwako Terada
Affiliation:
Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
Masayuki Nogami
Affiliation:
Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
Mitsuo Niinomi
Affiliation:
Department of Production Systems Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi 411-8580, Japan
*
a)Address all correspondence to this author.
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Abstract

Glass-ceramics containing a large amount of calcium pyrophosphate (β–Ca2P2O7) crystal were prepared via crystallization and sintering; compacts of a calcium phosphate glass powders with a composition of 60CaO · 30P2O5 · 5TiO2 · 5Na2O (in mol%) were heated for 3–6 h at 850 °C in air. The compacts were densified by the viscous flow of the glassy phases during heating. The calcium phosphate glass-ceramics were found to show a bending strength of approximately 100 MPa, and they were easy to machine, as confirmed by a drilling test using a conventional carbide tool. The machinability is thought to arise from the microstructure consisting predominantly of the interlocking and platelike β–Ca2P2O7 precipitated in the glass.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 3 , March 2001 , pp. 876 - 880
Copyright
Copyright © Materials Research Society 2001

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References

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